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Light rail vs driving calculator
Put your commuting days, light rail fare, miles, mileage rate and parking in: 20 days at $4.50 light rail is $90.00 against $450.00 driving.
★ COMPARISONS · COMMUTE · LIGHT RAIL VS DRIVING
Light Rail vs Driving Commute: $90.00 vs $450.00 a Month
On the defaults — 20 commuting days at $4.50 a day on light rail against 25 miles at $0.70 a mile plus $5.00 parking driving — light rail costs $90.00 a month and driving costs $450.00, so driving costs $360.00 more. This is the LIGHT RAIL version — a flat daily light rail fare against the driving model — the tram-vs-driving page is the TRAM version — a flat daily tram fare against the same driving model; the subway-vs-driving page is the SUBWAY version — an underground fare against the same driving model; the monorail-vs-driving page is the MONORAIL version — a flat daily monorail fare against the same driving model; and the shuttle-vs-driving page is the SHUTTLE version — a flat daily shuttle fare against the same driving model.
What does $90.00 vs $450.00 mean?
It means that one month of commuting costs $90.00 on light rail and $450.00 driving, so driving costs $360.00 more — and the light rail fare would have to reach $22.50 a day before the two sides met exactly. The driving side is the whole story in miniature: 25 miles at $0.70 a mile is $17.50 of mileage, plus $5.00 of parking, is $22.50 a driving day, times 20 days is $450.00. The part people get wrong is comparing the light rail fare to the parking alone: $4.50 against $5.00 looks close, but parking is only one slice of the driving day, and the mileage line is more than three times the parking line. The other part people get wrong is forgetting that both sides scale with days: a 10-day month halves both totals and halves the gap, so a part-month comparison that prices only one side at 10 days invents a gap that is not there.
Three things to check before you trust the number
Is $4.50 really the all-in light rail fare? Four dollars fifty is the daily light rail cost, and it is the figure the light rail line turns on: the $6.00-fare branch totals $120.00 against the $90.00 headline, so a $1.50 fare difference is $30.00 a month over 20 days. If the fare is really a monthly pass, average it honestly over the days actually ridden, not over calendar days — a $90.00 pass ridden 20 days is $4.50 a day, but the same pass ridden 10 days is $9.00 a day, and the gap moves with it.
Is $0.70 really the per-mile cost of driving? Seventy cents a mile is fuel, wear and depreciation rolled into one figure, and it is the figure the mileage line turns on: the 15-mile branch totals $310.00 driving against the $450.00 headline, so 10 fewer miles a day is $140.00 a month. If your car is cheaper to run, or dearer, the driving total moves by $0.10 a mile times 25 miles times 20 days — $50.00 a month for every 10 cents on the rate — so the mileage rate deserves more care than any other input here.
Is parking really $5.00 a day? Five dollars is the parking line, and it is the figure the parking branch turns on: the $10.00-parking branch totals $550.00 driving against the $450.00 headline, so dearer parking widens the gap by $100.00 a month. Free parking at work is the one change that genuinely helps driving — it cuts $100.00 off the driving total on these defaults — but even free parking leaves driving at $350.00 against $90.00 on light rail, because the mileage line alone is $350.00.
Worked example
On the defaults: 20 days, $4.50 light rail fare, 25 miles, $0.70 a mile, $5.00 parking.
- Light rail total: 20 × $4.50 is $90.00.
- Driving per day: 25 × $0.70 + $5.00 is $22.50.
- Driving total: 20 × $22.50 is $450.00.
- Gap: $450.00 − $90.00 is $360.00 — driving costs $360.00 more, and the break-even light rail fare is $22.50 a day.
And the other way: the light rail fare behind $90.00 is $4.50 a day, the miles behind $450.00 driving are 25, and the parking behind $450.00 driving is $5.00 a day. With 0 commuting days the model honestly shows $0.00 against $0.00 — exactly even — because neither side is used at all; and at a $22.50 light rail fare the two sides meet at $450.00 each, the break-even point itself.
Every branch, checked
- 10 commuting days, same light rail fare and driving costs: 10 commuting days, same light rail fare and driving costs: Light rail $45.00 vs driving $225.00 — driving costs $180.00 more.
- $6.00 light rail fare, 20 days: $6.00 light rail fare, 20 days: Light rail $120.00 vs driving $450.00 — driving costs $330.00 more.
- 15 round-trip miles, 20 days: 15 round-trip miles, 20 days: Light rail $90.00 vs driving $310.00 — driving costs $220.00 more.
- $10.00 parking a day, 20 days: $10.00 parking a day, 20 days: Light rail $90.00 vs driving $550.00 — driving costs $460.00 more.
The reverses, worked backwards
- Light rail fare behind $90.00 light rail: $4.50 a day — at $4.50 a day the figures are Light rail $90.00 vs driving $450.00 — driving costs $360.00 more.; at the lower neighbor the figures are Light rail $50.00 vs driving $450.00 — driving costs $400.00 more.; at the upper neighbor the figures are Light rail $130.00 vs driving $450.00 — driving costs $320.00 more..
- Round-trip miles behind $450.00 driving: 25 miles — at 25 miles the figures are Light rail $90.00 vs driving $450.00 — driving costs $360.00 more.; at the lower neighbor the figures are Light rail $90.00 vs driving $380.00 — driving costs $290.00 more.; at the upper neighbor the figures are Light rail $90.00 vs driving $520.00 — driving costs $430.00 more..
- Parking behind $450.00 driving: $5.00 a day — at $5.00 a day the figures are Light rail $90.00 vs driving $450.00 — driving costs $360.00 more.; at the lower neighbor the figures are Light rail $90.00 vs driving $350.00 — driving costs $260.00 more.; at the upper neighbor the figures are Light rail $90.00 vs driving $550.00 — driving costs $460.00 more..
What the defaults assume
The defaults are 20 commuting days, a $4.50 light rail fare, 25 round-trip miles at $0.70 a mile and $5.00 parking, so the headline is one commuter’s month with a mid-priced street-level fare against a mid-distance drive. The model is two multiplications and a subtraction: the light rail line is days times the fare, the driving line is days times miles times the mileage rate plus parking, and the gap is the driving line minus the light rail line. The fare reverse is checked at $2.00 either side, because $2.00 over 20 days is $40.00; the miles reverse is checked at 5 miles either side, because 5 miles at $0.70 over 20 days is $70.00; the parking reverse is checked at $5.00 either side, because $5.00 over 20 days is $100.00. The model does not include light rail station parking, tolls, vehicle purchase or insurance fixed costs, or the value of time — price those separately.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Light rail total | commuting days × light rail fare | $90.00 — 20 × $4.50. |
| Driving per day | round-trip miles × mileage rate + parking | $22.50 — 25 × $0.70 + $5.00. |
| Driving total | commuting days × driving per day | $450.00 — 20 × $22.50. |
| Gap | driving total − light rail total | $360.00 — $450.00 − $90.00, driving costs more. |
| Break-even light rail fare | driving per day | $22.50 a day — the fare at which light rail equals driving. |
| Light rail fare behind a target light rail total | target light rail total ÷ commuting days | $4.50 — $90.00 ÷ 20. |
| Miles behind a target driving total | (target driving total ÷ days − parking) ÷ mileage rate | 25 miles — ($450.00 ÷ 20 − $5.00) ÷ $0.70. |
| Parking behind a target driving total | target driving total ÷ days − miles × mileage rate | $5.00 — $450.00 ÷ 20 − 25 × $0.70. |
| Light rail as a share of driving | light rail total ÷ driving total | 20.00% — $90.00 ÷ $450.00, light rail costs a fifth of driving. |
| 10 commuting days, same light rail fare and driving costs | same model | Light rail $45.00 vs driving $225.00 — driving costs $180.00 more. |
| $6.00 light rail fare, 20 days | same model | Light rail $120.00 vs driving $450.00 — driving costs $330.00 more. |
| 15 round-trip miles, 20 days | same model | Light rail $90.00 vs driving $310.00 — driving costs $220.00 more. |
| $10.00 parking a day, 20 days | same model | Light rail $90.00 vs driving $550.00 — driving costs $460.00 more. |
| Light rail fare behind $90.00 light rail | reverse | $4.50 a day: Light rail $90.00 vs driving $450.00 — driving costs $360.00 more. |
| Round-trip miles behind $450.00 driving | reverse | 25 miles: Light rail $90.00 vs driving $450.00 — driving costs $360.00 more. |
| Parking behind $450.00 driving | reverse | $5.00 a day: Light rail $90.00 vs driving $450.00 — driving costs $360.00 more. |
| 0 commuting days | same model | Light rail $0.00 vs driving $0.00 — exactly even. |
| Negative commuting days | same model | Commuting days — 0 or more. |
| Negative light rail fare | same model | Light rail rate — $0 or more. |
| $22.50 light rail fare, 20 days | same model | Light rail $450.00 vs driving $450.00 — exactly even. |
Who uses this
- A commuter weighing a light rail pass — 20 days at $4.50 against $450.00 driving is a $360.00 monthly saving, with the branches showing what a shorter month or dearer parking does to the gap.
- An employer costing a transit benefit — the break-even fare of $22.50 a day prices the most generous light rail subsidy that still beats driving, so a benefit can be set with the ceiling known.
- A household choosing where to live — the miles reverse shows how the driving side grows with distance, so a move 5 miles farther out adds $70.00 a month to driving and nothing to the light rail line.
- A budgeter checking a commute claim — the reverses recover the fare, the miles or the parking behind any quoted monthly total.
Accuracy & limitations
Figures are the model’s own arithmetic on the numbers you type, computed from unrounded values and displayed rounded HALF_UP to 2dp. The main limitation is the inputs, not the arithmetic: whether the light rail fare is a true daily figure or a pass averaged over the wrong day count, whether the mileage rate reflects your car, and whether parking is really charged every driving day are all judgement calls, and this page prices the figures you enter without checking them. This page is a calculation tool, not transport or financial advice.
Cite this calculator
20 days light rail at $4.50 costs $90.00 vs $450.00 driving 25 miles at $0.70 a mile plus $5.00 parking: driving costs $360.00 more. Source: Bright Side Kit, https://brightoolbox.com/light-rail-vs-driving/, accessed 29 October 2026.
Frequently asked questions
What is the break-even light rail fare?
The daily light rail fare at which the light rail month equals the driving month: $22.50 a day on these defaults, because driving costs $22.50 a day. Below $22.50 light rail wins; above it, driving wins; exactly at it, the two sides are even at $450.00 each.
Why does free parking not make driving win?
Because parking is only $5.00 of the $22.50 driving day. Free parking cuts driving to $350.00 a month, still $260.00 above the $90.00 light rail month — the mileage line alone, $350.00, is nearly four times the light rail total.
Should the mileage rate include the car payment?
Only if you are comparing the full cost of owning the car against light rail. The $0.70 default covers fuel, wear and depreciation; adding a fixed monthly payment to a per-mile rate double-counts it on days you do not drive. Price fixed car costs as a separate monthly line if they belong in your comparison.
What if I only commute some days by light rail?
Then split the month: light rail days at the light rail fare, driving days at the driving day rate, and add the two stretches. A single blended fare over mixed days hides the mix and misstates both sides.
Why does 0 commuting days show exactly even?
Because with no commuting days neither side is used: $0.00 against $0.00. It is an honest edge, not a recommendation — it shows both sides scale with days, so a comparison at the wrong day count invents or erases the gap.
How is a light rail comparison different from a monorail comparison?
Only the fare line changes: a light rail fare of $4.50 a day against the same driving model, where the monorail page uses $3.50 a day. The driving model — 25 miles at $0.70 plus $5.00 parking — is identical, which is what makes the pages comparable.